Jimmyproof lock



June 12, 1928. 1,673,468

P. J. PALINKAS J IMMYPROOF LOCK Filed Dec. 14, 1926 Patented June 12, 1928.

UNITED STATES PAUL J. PALINKAS, 01 SOUTH nonwamz, CONNECTICUT.

J-IMmYrRooF Loan.

Application filed December 14, 1926. Serial No; 154,679.

This invention relates to locks, and par ticularly to a so-called jimmy proof lock in which the lock bolt is soengagedmth the strike or keeper that the bolt cannot be pried.

away from the keeper by inserting a jimmying tool between the door and the jamb to pry them apart, and has for an object to provide an improved structurefor this type of lock which will be of more simple construction than those now generally employed and so may be manufactured and assembled at less cost and will not be likely to get out of order in operation, and also to provide a strucure in which the operation will'be posi tive and reliable. r

\Vith the foregoing and other objects in view. I have devised the construction illustrated in the accompanying drawing forming a part of this specification. In this drawing, j

Fig. 1 is a side elevation of a lock with the cover removed showing its relation to the keeper, and also showing, the bolt in the unlocked or retracted position.

Fig. 2 is a transverse section substantially on line 22 of Fig. 1, and l Fig. 3 is a view similar to Fig. 1 but showing the bolt in the locked position.

The lock includes the usual casing 5 adapted to be mortised into the door and carrying the lock mechanism. This mechanism includes the movable locking bolt which is composed of three sections, an intermediate section 6 and two outer sections 7 and 8. These latter sections are the same in construction butare reversed. Each comprisesa body portion and at its outer end havea laterally outwardly extending lug 9 forming a hook portion. The body portions are provided with two L-shaped slots the longer portion 10 of which extends longitudinally of the members and the shorterpor tion 11 extends at rightanglesthereto, and

these slots receive guide pins 12 carried by the casing 5.

The intermediate section dismounted to slide longitudinally of the casing and has a longitudinal slot 13 to receive guide pins 14 1 carried by the casing. It will'be notedfrom an inspection of Figs. 1 and'S that when the bolt is retracted the forward hook portions of the outer sections 7 and '8' are together while the body portions are separated and a portion of the intermediate section 6 is between them. The remaining portion of cylinder, I not shown.

the intermediate section is-of greater width forming inclined or curved cam surfaces 15, and the smaller or outer end of this intermediate section is provided withsimilarly inclined cam surfaces 16. While in the re- ,coaction with the finger or follower 21 by which the bolt maybe operated to and from the locking position. This finger or follower maybe operated by any key controlled means suchas the well known pin-tumbler Suitable, springs 22 are mounted in the casing 23 and restadjacent their free ends 245 against the outer side edges of the outer sections 7 and 8 and tend to move these-sections laterally toward each other. i 1 V Each section Tand 8 carries a pin 25 WlllCl]. are adapted under certain conditions presently to be described to be engaged by a cross bar 26 carried on' the intermediate memberti. This bar may be cast as an in tegralpart of the section or it may be ,a

separate element secured 'tothc section by any. suitable means, such as screwsf27r The forward end of the bolt 15" adapted to pass through an opening in the plate 28 :secured I to the edge of the door and coactsv with-a keeper 29 which is preferably in the formof a plate secured to the jamb 30. This keeper has an opening 31 of suiiicient'sizefor passage of the outer ends of the two sections 7 and Swhen they are together, as indicated in dotted lines, Fig. 1, but isSmaHer than the distance between the outer ends when these sections are separated, as. shownin Fig.3. Theopen side of the casing after the lock is assembled is closed by the usual cover plate 32 securedby screws threaded into the casing atthe tappedholes 33.

The operation is as follows: The normal unlocked position of the elements is shown "in Fig. 1, and it will be noted, that in thisv position the hooked outer end portions of the outer sections 7 and 8 are withdrawn from the keeper '29; and thereforeqthe-door pins12are in the longitudinal portionslO of t-he L-shaped slots in these sections, and

is unlocked. Also in this position the guide 60 ,tracted position the cams 15 engage the j lock the door the finger or follower- 21 is swungto the left or counterclockwise, .as

viewed in Fig. 1. During the first part of .1

its movement, 0211p to thedotted line position of Fig. 1, thecam slfiand' lb c'oop'er'ating with thecorners 17 and 18 cause the three sections 6, 7 and 8 to move forwardly as a unit because the sections 7 anda8= are held against lateral movement as the pins 12 are in the longitndinallyextending portions ofpfthe l.'-shaped -slots. Therefore, the

1 three sections move forwardly as a unit and the hook shaped outer ends 9 are passed through the'openin 31 in, the keeper tothe dotted line positionshown inFig. 1. In this position the'pins12 engage the inner ends of the slots: 10 and :prevent further forward movementof thetsections 7 and 8, but the pins'iaie now in alignment with the transverse portions 11 of these is'lotsg andfltherefore, *the sections land 8 are free to move laterally outward. Therefore, continued forward movement of the intermediate sectib'nkfi'under the action of the follower 21 will cause the cams 15 and 16 to react on thecorners 17 andyl8-and -separaite the sec tions 'iancl 8 as indicated in Fig. 3,' and after they are separatedthey will beheld in this position by engagement of "the inner edges of the sections 7 and 8 with the dnter edg'esof the intermediate section 6 asclearly shown inFig. 3. At the completion of this :action the hooks or ll 1gS9 are projected behind: theYkeeper and the pins 12 are at the inner endsof the slots 11. It will be apparent that now if a jimmy were inserted between the edge bfthe door and the jamb and afnjeffort made to pry them apart the lugs 9 would engage the back of the keeper 29 and prevent their separating. This will prevent the withdrawing'of the bolt from the keeper by this ji'inmying action. It will ends-thereon fii1ger 21 to the right or clockwise as viewed TingFig. 3, will first move the intermediate F section' 6 inwardly or tor the right. The

onters'ections 7 and 8 will be held stationary by the pihs-12 dnt'ilthe section 6*has been retractedsuflicintly to allowthe corners 17 1 and 18 m rundownftheeams 15 and 16. At this til'n'ethe sections 7 andrS will be moved 1 1 inwardly toward eaclfother by the springs "1:221until thepins 12 ,arerin alighmeht-with -the po'rtions10 of thet Lshaped slots. At about this timewthe crossfbar26 carried by Athe intermediatesection 6 engages the pins 25, carried by the outer sections 7 and Bland through. them ,.-f urther backward movement of section 6 will carry sections 7 and 8 with it to the originalposition shown in full lines Fig.1, and thus the bolt is completely removed from the keeper.

It will be apparent from the foregoing that "the lock is very simple in construction,

that the action is positive in both directions, that during the first part of the locking movement, or the movement to pass the projecting or outer ends of the bolt into the keeper, the three sections of the bolt move as :a unitand then the longitudinal movement ,ofthe' outersections is arrested andthey are separated to cause their hooked portions to engage. in back of the keeper further longitudinal movement of the intermediate section} On the reverse, or unlocking move ment the first part of the movement of the intermediate section allows the-outer section to bemoved inwardly, to b'ringthe hooked end portions from ahgnmentlvith the rear wall of the k eper; and thentthc three scotions move as a unit to withdraw the bolt from the keeper. This construction, effectively prevents separation of the bolt and the keeper by a jimmying actionand the projecting bolt sections are locked, so that they cannot be forced inwardly by 'a'too], because of the holding action 0 the pins 12.

Having thus set forth the naturefof my ii'iventiom-whatl claim is:- l

1. In a lock, afbolticomprising threesections' movable together as a unitfrom retracted to extended position, mcansr'nonnting" the "outer sections for. sliding movements both longitudinally and laterally and saidsections having outwardly extending hook portions at their outer ends, enacting means on the, central and other sections to slide the outer sections laterally on further continued i inovement of the central section, and means for operating 'thecentral section. 2. In alock, a boltinclud-ing a locking "section and an operatingscction, a casing,

said lockingsection beingprovid'e'd with a pair of substantially L-shaped slots, guide pins on the casing extending into saidslots,

nmeans tor guiding the operating section for reclprocator'y movements, cooperating cam surfaces on the two sectionscausing them to:

first-move as a unit to project the locking sectionand then to cause the locking section to movelaterallyzupon further movementof the operating-section, and means forreciprocating the operating section m 3. Ina lock, a belt comprising a paii: of locking sections and an operating section, means for guiding the opera'tings'ection for reciprocatory iinovements, said locking sections ea'chihaving a hook shaped end, then hooks extending outwardly in opposite Hi:

rections, said locking sections being "each also provided with a pair 'of substantially L- shaped slots, stationary guide pins in said slots adapted to arrest longitudinal move-t ment of the sections at a given point, the opcrating section extending between the other sections and provided with cam surfaces engaging surfaces on the other sections to cause the sections to move forwardly as a unit to extend the hooks and when the looking sections are arrested by the guide pins to separate said sections, and means for shifting the operating section.

4:. In a look, a bolt comprising a pair of locking sections and an operating section, a longitudinal slot in said operating section, guide pins in said slot. said locking sections each having a hook shaped end, the hooks extending outwardly in opposite directions,

said locking sections being each provided with a pair of substantially L-shaped slots arranged with the body portions thereof exthe slots and to move the locking sections laterally outward with the pins in the transverse portions of the slots.

5. In alock, a bolt including a locking section and an operating section, said looking section having a laterally extending hook portion at its outer end, means for guiding said locking section for longitudn nal movement without lateral movement and for lateral movement without longitudinal movement, means for guiding the operating section for longitudinal movement, cooperating means carried by the sections to cause them to first move longitudinally as a unit to extend said hook portion and then to shift the looking section laterally, a lost motion connection between the sections to withdraw the locking section, and means for shifting the operating section.

6. In a look, a bolt including a locking section and an operating section, said looking section having a laterally extending hook portion atits outer end and a pair of,

substantially L-shaped slots arranged with the cross bar thereof extending transversely of the section, guide pins in said slots, means i for guidingthe operating section for longitudinal movement, cooperating cam means on the sections tocause them to first move outwardly as a unit and thento shift the lockingsection laterally, means for shifting a I the operating section, and a lost motion connection between the sections to retract the locking section. v y

7. In a look, a bolt comprising a pair of locking sections and an operating section' said locking SQCtIOIIS bemgeach provided with a hook portion at its outer end and arranged withithehook extending laterally outward, means for guiding the locking sections for movement first longitudinally forward and then laterally, outward in opposite directions, means for guiding the operating section for longitudinal movement, coactmg cam means on the sections to cause them to first move longitudinally as a unit and then to shift the locking sections laterally outward on further movement of the operating section, means to shift the operating section, a lost motion connection between the operating and the locking sections to retract the latter, and springs tending to shift the locking sections laterally inward.

In testimony whereof I afiix my signature this 22nd day of November, 1926.

PAUL J. PALINKAS. 

